Nut-lock.



No. 644,630.- Patented Mar. 6, I900. J. PEARSON.

NUT LOCK.

(Application filed Mar. 9, 1899.) N 0 M 0 d el 3 WITNESSES IN VENTORATTORNEY.

n: uunms PEYERS co. PNOTO-L|7ND.. WASHINGTON. my C NITED STATES ATENTFFICE.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 644,630, dated March 6,1900.

Application filed March 9, 1899. Serial No. 708,426- (No modelfldrawings, which form a part of this specification.

This invention has relation to a novel im- 7 provement in nut-locks.

The object of my invention is to provide a simple device by means ofwhich a nut may be securely locked upon a bolt, and in furthering theaim of my invention I provide a suitable keeper adapted to be used inconnection with a suitable nut adapted to lock said nut.

In the accompanying drawings lhave shown in Figure 1 a view, part insection and with portions broken away, of abolt provided with myimproved nut-lock. Fig. 2 shows a top View of a nut locked by means ofmy keeper, while Fig. 3 shows one of my keepers as detached andconstructed to be used in connection with a hexagonal nut.

In the accompanying drawings, 2 represents an ordinary bolt which isprovided with the right-handed screw-thread 4 and a left-handedscrew-thread 5, the thread 5 being upon a portion of the bolt ofadiameterless than the bolt proper. This bolt 2 in the drawings isrepresented as securing the two sections 3 and at. In doing this I firstthread an ordinary rectangular nut 6 upon the thread 4 until the twoparts 3 and 4: are tightly united; After this nut is in position Ithread the nut 7 upon the thread 5 in an opposite direction until bothof the nuts coincide, so that their four outer sides come in likeplanes. I then drop a keeper .over the upper nut until it strikes theupper surface of the object to be secured, and this keeperis of a lengthslightly exceeding the length of the lower nut, upon which it fits infrictional contact; but this keeper is provided with removed portions10, as is shown in Fig. 2, which are angular and which permit the uppernut 7 being unlocked a suitable distance until the upper nut strikes thevertical portion of the seating within the keeper. In Fig. 2 Ihave shownthe upper nut7 as partially unwound, so as to carry this upper nutbeyond the lower nut 6, so that this upper nut is held partially unwoundwithin the seating 10 of the keeper. Now it is simply impossible for theupper nut 7 to unwind, for the reason that the shoulders of the seating10 form a secure stop at four points to this upper nut 7 and so lock theupper nut in a partially-unwound condition. As the lower nut threads inadirection opposite to the upper nut, it is of course seen that the onlyway to unlock two nuts secured by means of my improved keeper would beto thread the upper nut upon its bolt, so that the upper nut wouldcoincide with the lower, and then remove the keeper 8, which ispreferably held in frictional contact upon the lower nut. The keeper isthen removed, when the two nuts can be readily unwound.

In place of providing a bolt with a right and left handed thread thesame maybe provided with an ordinary washer of a size corresponding tothe size of the nut, and which washer is to be fixed either to the boltor to the upper surface of the article upon which it binds, when the nutproper may be threaded upon this square washer. The keeper, which isadapted to snugly encompass the washer, is then placed in position, whenthe nut is partially unwound, so that it may look within the seatings ofthe keeper. It is of course understood that the horizontal surface ofthe angular seating 10 comes slightly below the lower surface of theupper nut, so that this upper nut may always readily work into thisseating, where it is held.

Having thus described my said invention, what I claim as new, and desireto secure by United States Letters Patent, is-

A nut-lock comprising a bolt, having a right and left handed thread, twonuts of like conformation, one adapted to fit upon said right, and oneupon said left handed thread, and a keeper adapted to bind upon saidlower nut, and provided with a plurality of seatings, so that as saidupper nut is partially unscrewed it rises within and engages saidseatings, as and for the purpose set forth.

Signed in the presence of two witnesses.

JOHN PEARSON.

Witnesses:

GEORGE W. Suns, MABEL A. DODSWORTH.

